It is no uncommon making mistakes trying to figure out what you were doing based only on the movement pattern of your wrist; i.e. auto- recognized exercised. If you never swim, or use the Exercise App when you do, you can prevent this as follows:
From phone app Today screen, tap Gear (settings) icon at top right > Account & Wellness > Exercise
Lists the 7 possible auto-recognized exercises. You can set any you never do to "Ignored", and change the minimum time for them to count as an exercise session. If you set as "Ignored", you can do with the Exercise App, but if will not Auto-Recognize that activity.
Before posting, re-read to see if it would make sense to someone else not looking at your Fitbit or phone.
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